Max iiaussler



(No Model.)

M HAUSSLER PIR'ING DEVICE PoR BOILBRS.

No. 600,673. Patented Mar. 15,1898.

Wa F14 95,5 es:

lhvrrnn MAX HUSSLER, OF BERLIN, GERMANY.

FIRING DEVICE FOR BOILERS.

SPECIFICATION forming part of Letters Patent No. 600,673, dated March 15, 1898.

Application fled February 8, 1897. Serial No. 622,569. (No model.)

To all whom it may concern.-

Be it known that I, MAX HUSSLER, a subject of the King of Prussia, German Emperor, and a resident of Berlin, in the Kingdomof Prussia, German Empire, have invented certain new and useful Improvements in Firing Devices for Boilers and the Like, of which the following is an exact specification.

This invention refers in general to boilers and to the furnaces of the same, and in par ticular to devices for firing coal-dust and for feeding the latter into the furnace.

The objects of my improvements are, first, to avoid wasting the coal-dust, and, second, to obtain a better exhaustion of the heat resulting from the combustion of said coal-dust. I attain said objects7 first, by making the coaldust enter the furnace with such a velocity only as corresponds to the draft of the chimney, and, second, by forming the inner surfaces of the walls of the furnace into concave shape and by rounding off the edges, corners, and angles of the flues of the boiler, so as thereby to prevent any precipitation of par ticles of ashes and the like. The precipitation of coal-dust proper is nearly fully done away with by the means first lnentioned. The particular feature of this means resides in the configuration of the tube leading the coaldust from the distributing and driving or feeding apparatus to and into the furnace, in

` that the diameter of said tube decreases in vertical direction and increasesin horizontal direction from said apparatus to said furnace. In other words, the free section of the said tube increases in the direction to the furnace, so that the speed of the mixture of coal-dust and air passing through the tube is correspondingly decreased, said decrease being regulated so that the velocity of the coal-dust corresponds to the strength of the draft of the furnace, as aforementioned.

In order to make my invention more clear, I refer to the accompanying drawings, in which similar letters denote similar parts throughout the different views, and in which- Figure l is a diagrammatical View of a vertical longitudinal section through the boiler, the furnace, and the coal-dust distributing and feeding apparatus. Fig. 2 is a vertical 5 6 of Fig. 1.

distributing and feeding apparatus; and Fig. i

is, as is seen, a Lancashire boiler, the heating-tubes a a of which connect the rear Iiue e2 with a front liue e3. The flue ecorresponds `with the furnace e by the bottom flue c', and

the flue c3 corresponds with the chimney (not shown) by the lateral flues c4 e5, all as known with boilers of such type.

It is distinctly to be seen from Figs.` l and 2 that the inner surfaces of the walls of the furnace e are formed into concave shape, and it is further to be seen that the same configuration is applied to the flues c e4 e5. Furthermore, the edges, corners, and angles of the fines e' e4 e5, as well as of the iiues e2 e3, are roundedoff, so that obviously no precipitation whatever` can take place.

Owing to the coal-dust being fed into the furnace @with a speed corresponding to the draft of the chimney, the combustion of the coal-dust is of course more perfect than if the speed of the air driven into the furnace exceeds the strength of the chimney draft. Thus in consequence of said'more perfect combustion the heat developed is correspondingly greater. In order to cause said heat to pass over more to the boiler proper than to the masonry of the same, I prefer to arrange heatisolating plates within said masonry in close proximity to the fines.

The front portion of the bottom iue e' forms an incline which extends down to the rear end of the grate o. Between said rear end of the grate and the lower front end of said bottom flue is left a small space, which generally is closed by a hinged plate u. The space mem tioned is kept open as long as the boiler is fired with coal-dust, so that the slag accumulating upon said inclined portion of the bottom iiue e can iiow down into the ash-pit r of the furnace.

The purpose of providing the furnace with itself. Therefore the boiler is first fired with any suitable sort of coal burned in ordinary manner upon the grate o. As soon, however, as the steam produced has reached a tension sufficient for driving the coal-dust distributing and feeding apparatus this latter is caused -to come into operation, when the grate o is not charged any further with t-he ordinary coal. The furnace is then fed with the coaldust only, and the hinged plate u, which up to then was of course closed, is opened, so as to allow of the slag iiowing down into the ashpit r, as aforementioned.

The coal-dust distributing and feeding apparatus consists of the hopper s, the conveyingscrew ai, delivering the coal-dust from said hopper into the pipe z, and the tube m, communicating with the pipe z and having at its outer end a blower w for driving air into it and terminating with its other end into the furnace e, said other end having an inclined position and being directed to the inclined front portion of the bottom iiue e', as distinctly shown in Fig. l.

In order to hinder the tube m from forming an obstacle for the fireman on attending the furnace, the portion m of the tube m is vertically cranked for such a height that the fireman need not bend or bow on passing through below said portion fm. The portion m' is that which increases in breadth or width in the direction to the furnace, said increase being so measured that also the free section of the portion m' of the tube m increases, so that the speed of the coal-dust is correspondingly decreased, as already mentioned.

Another particular feature of the coal-dust distributing and feeding apparatus resides in the arrangement of a number of superposed horizontal pliable plates or bands b, which are arranged in steps below the termination of the pipe z. The coal-dust falling upon said bands causes these latter to oscillate, and a similar result is brought about by the air that is driven by the blower w into the ters Patent of the United States isl. The combination with a boiler, of a furnace having a grate and having the inner sur-A face of its walls concave; a iiue extending below the boiler proper, and forming in its front portion an incline extending down to the rear end of said grate; a hinged plate arranged between said rear end of the grate and the lower front end of said flue; an inclined slot arranged within the wall portion above the grate, and being directed toward the inclined lower wall of the flue, and means for driving coal-dust through said slot into the furnace, as set forth.

2. The combination with a boiler, of a furnace having a grate, and having the inner sur.- faces of its walls formed into concave shape; a coal-dust distributing and driving apparatus arranged outside the boiler; a tube connecting said apparatus with said furnace and decreasing in vertical and increasing in horizontal diameter toward said furnace; a pipe arranged about rectangularly to said tube and terminating from above into the same and adapted to lead the coal-dust into the tube; a series of superposed pliable bands d arranged below the termination of said pipe in some distance one from the other, and means for driving air through the spaces be# tween said bands, for the purpose set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

MAX I-IUSSLER.

Witnesses: n

HERMANN MLLER, JULIUs MAEMECKE. 

